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Consolidated Balance Sheet (Parenthetical) (USD $)
In Millions, except Per Share data, unless otherwise specified
Dec. 27, 2014
Dec. 28, 2013
Statement of Financial Position [Abstract]    
Common stock, par value $ 0.0167us-gaap_CommonStockParOrStatedValuePerShare $ 0.0167us-gaap_CommonStockParOrStatedValuePerShare
Common stock, authorized 3,600us-gaap_CommonStockSharesAuthorized 3,600us-gaap_CommonStockSharesAuthorized
Common stock, issued 1,488us-gaap_CommonStockSharesIssued 1,529us-gaap_CommonStockSharesIssued
Repurchased common stock, shares 378us-gaap_TreasuryStockShares 337us-gaap_TreasuryStockShares